Oscillating table coal breaker



June 22, 1937. B. NORTON OSCILLATING TABLE COAL BREAKER Filed Oct. 25, 1933 2 Sheets-Sheet 17 [in III .MQHwQQGUHWM -unwuhuhhhunwhumnmnu mwoooo 2 wmv we ,3 M6 704 ATTORNEY;

June 22, 1937. B. NORTON 2,084,622

OSCILLATING TABLE COAL BREAKER Filed Oct. 25, 1955 2 Sheets-Sheet 2 Fig. 2.

Patented June 22, 1937 PATENT OFFICE 2,084,622 OSCILLATING TABLE COAL BREAKER Bertram Norton, Claverley, England Application October 25, 1933, Serial'No. 695,185

' In Great Britain March 2-7, 1933 3 Claims.

,This invention relates to machines for breaking coal or other friable material of the kind in which picks are lowered into contact with coal or the like-moved beneath them and are then raised again.

, An object of the invention is to. provide a coal breaking machine which produces a larger proportion of the desired size of coal than has hitherto been possible. A further object of the 10 invention is toprovide a machine in which any coal of the required size that is fed into the machine is by-passed so' that it is not struck by the picks.

In the constructions according to the present invention an oscillatingtable is used to convey the coal beneath the picks, and according to an important feature of the invention it is formed with one or more imperforate portions at the pointer; points where the coal-is struck by the picks, and with one or more perforated portions to allow small' coal to pass through before being struck by the picks. It is found that by this means'a greater-proportion ofthe desired .size of coal-is formed during the breaking than with the prior machines.

gIn the preferred construction there are two sets of picks carried by va single frame, namely preliminary picks and sizing picks, and the table is made with an imperforate surface at the places whereit is struck by both sets of picks and is perforated both ahead of the preliminary picks and between the two sets of picks. The perforations on the'first part of the surface, 1. e. ahead of the preliminary picks, allow small coal to pass through the table without being broken by picks, While the perforations between the two sets of picks allow small coal formed by the preliminary picks to pass through without being struck by the sizing picks. There are, however, no perfora- 40 tions at the actual striking points, and this leads to a reduction in the amount of very fine coal formed in the machine.

It is desirable to connect together the oscillating table and the frame carrying the picks in such a way that the table is practically stationary when the picks are actually striking the coal. Moreover, with a table constructed as described above it is particularly desirable to provide means to prevent the risk of damage to the picks if some very hard substance is struck. The invention therefore also comprises the combination of a pivoted frame carrying sets of picks on the same side of the pivot of the frame, an oscillating table resiliently mounted beneath the picks, and means connecting the table and frame to cause the table to oscillate as the picks moveup and down.

In order that the invention may be clearly understood and readily carried into effect, one machine constructed in accordance therewith will now be described by way of example, with reference to the accompanying drawings, in which Figure 1 shows a central longitudinal section through the machine, and

Figures 2, 3 and 4 are sections on the lines II-II, III-III, and IV-IV respectively of Figure'l.

The machine comprises two main side members l supporting a crank-shaft 2 which carries flywheels 3 and is driven from any suitable source of power. The crank-shaft is connected by connecting rods 4 to an oscillating or rocking frame 5 pivotally mounted on a horizontally disposed shaft 6, the arrangement being such that the frame 5 is driven directly from above through the crank shaft 2 and the connecting rods 4. The frame 5 carries a set of'preliminary picks and a set of sizing picks '8, of which the preliminary picks are'carried in a single head and are spacedrelatively far apart and of which the sizing picks are also carried in a single head and are arranged in'rows of number and with interrow spacing as to effect, in correlation with the set of preliminary picks, the formation of coal pieces of desired size. While I have shown a set of sizing picks consisting of six rows of picks, I do not wish to be limited in this respect, although I have found that at least four rows of sizing picks are necessary to effect the desired sizing action.

The coal to be broken is fed onto the upper end of a table 9 which is swingingly suspended by rods I0 from two shafts ll, carried in bearings I2 supported by helical springs l3. These springs bear on brackets I4 fixed to the side members I. The table 9 is oscillated or rocked through connecting rods l5 directly connected to the frame 5 at a point or points thereof lying between the pivotal mounting 6 and the sizing picks 8.

The upper part of the table is perforate, being formed with holes Hithrough which relatively small coal can pass onto a chute ll. Those parts of the table 9 which lie beneath the picks I and 8 when they strike the coal are imperforate, but the part which lies between the picks during the striking is perforate, being formed with holes [8. Small coal formed by the preliminary picks can pass through these holes and thus escape being struck by the sizing picks and reduced further in size.

The oscillations imparted to the table 9 by the crank-shaft 2 through the medium of the frame 5 and connecting rods l5 serve to move the coal forwards until it falls off the table onto the chute ll. It is an important feature of the construction that the table, and thus the coal, is practically stationary at the end of its rearward stroke (Figure 1) during the time that the picks are in contact with the coal, since this leads to a substantial reduction in the amount of fine coal formed.

If any stone or other very hard body is struck by the picks, the table 9 can yield against the action of the springs l3.

While the machine has been particularly described with reference to coal breaking, it is obvious that it may be used to break other friable material.

I claim:

1. In a machine for sizing friable material, a pivoted frame, sets of preliminary and sizing picks carried thereby, of which the preliminary picks are carried in a single head and are spaced relatively far apart, and the sizing picks are also carried in a single head and are arranged in rows of number and with inter-row spacing as to effect the formation of coal pieces of desired size, means located above and connected to said frame for rocking the frame about a horizontal axis, an oscillatable conveyer table having its surface formed with two imperforate parts and a perforated part located between the two imperforate parts, means for oscillating said table so that it can convey material beneath said picks, said material being caused to pass from one of said imperforate parts over said perforated part to the other of said imperforate parts, said oscillating means connecting said table to said pivoted frame whereby said table is driven from said pivoted frame, the arrangement being such that the table is substantially at the end of its rearward stroke when the frame is in its lowermost position, that said preliminary picks strike material on one of said imperforate parts, and that small material, formed by said preliminary picks, passes through said perforated part while said sizing picks strike material that reaches the other imperforate part,

2. In a machine for sizing friable material, a pivoted frame, sets of preliminary and sizing picks carried thereby, of which the preliminary picks are spaced relatively far apart, and the sizing picks are arranged in rows of number and with inter-row spacing as to effect the formation of coal pieces of desired size, means for rocking the frame about a horizontal axis, an oscillatable conveyor table having its surface formed with two imperforate parts and a perforated part located between the two imperforate parts, means for oscillating said table so that it can convey material beneath said picks, said material being caused to pass from one of said imperforate parts over said perforated part to the other ofsaid imperforate parts, said oscillating means connecting said table to said pivoted frame whereby said table is driven from said pivoted frame, the arrangement being such that the table is substantially at the end of its rearward stroke when the frame is in its lowermost position, that said preliminary picks strike material on one of said imperforate parts and that small material, formed by said preliminary picks, passes through said perforated part while said sizing picks strike material that reaches the other imperforate part.

3. In a machine for sizing friable material, a pivoted frame, sets of preliminary and sizing picks carried thereby, of which the preliminary picks are spaced relatively far apart, and the sizing picks are arranged in rows of number and with inter-row spacing as to effect the formationof coal pieces of desired size, means located above and connected vto said frame for rocking the frame about a horizontal axis, an oscillatable conveyor table having its surface formed with two imperforate parts and a perforated part located betweenthe two imperforate parts, means for oscillating said table so that it can convey material beneath said picks, said material being caused to pass from one of said imperforate parts over said perforated part to the other of said imperforate parts, and means including the first and the sec- I end means aforesaid for synchronizing the rocking movement of the frame and the oscillating movement of the table, the arrangement being such that the table is substantially at the end of its rearward stroke when the frame is in its lowerg 

